OBD Guide
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P1663

Fuel Demand Command Signal Circuit Malfunction

P1663 is an OBD-II diagnostic trouble code meaning: Fuel Demand Command Signal Circuit Malfunction. Common causes: open or short circuit in the fuel supply command signal circuit, fuel sensor malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable engine operation
  • Increased fuel consumption
  • Power Loss
  • The engine stalls
  • Check Engine light comes on

Causes

  • Open or short circuit in the fuel supply command signal circuit
  • Fuel sensor malfunction
  • Problems with the engine control unit (ECU)
  • Bad contacts in connectors
  • Wiring corrosion

How to Fix

  1. Check the integrity of wiring and connectors
  2. Check the operation of the fuel sensor
  3. Check the condition of the engine control unit (ECU)
  4. Replace damaged components
  5. Clean contacts from corrosion

Related codes

P1662P1664P1665

Error P1663 by Vehicle Brand

BuickCadillacChevroletFordGMGMCLexusLincolnMercuryOldsmobileSaturn

FAQ

What does the P1663 code mean?

P1663 is an OBD-II diagnostic trouble code that indicates: Fuel Demand Command Signal Circuit Malfunction

What causes a P1663 error code?

The most common causes of P1663 include: Open or short circuit in the fuel supply command signal circuit; Fuel sensor malfunction; Problems with the engine control unit (ECU); Bad contacts in connectors.

How do I fix a P1663 diagnostic trouble code?

To fix P1663: Check the integrity of wiring and connectors. Check the operation of the fuel sensor. Check the condition of the engine control unit (ECU). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1663?

Yes, but get it checked soon

How much does it cost to fix P1663?

The estimated repair cost for P1663 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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